Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion
Author Posting. © Company of Biologists, 2019. This article is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 223 (2019): jeb.216283, doi:10.1242/jeb.216283. Toothed whales have evol...
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Online Access: | https://hdl.handle.net/1912/25421 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/25421 2023-05-15T18:33:30+02:00 Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion Jensen, Frants H. Keller, Onno A. Tyack, Peter L. Visser, Fleur 2019-12-10 https://hdl.handle.net/1912/25421 unknown Company of Biologists https://doi.org/10.1242/jeb.216283 Jensen, F. H., Keller, O. A., Tyack, P. L., & Visser, F. (2019). Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion. The Journal of Experimental Biology, 223, jeb.216283. https://hdl.handle.net/1912/25421 doi:10.1242/jeb.216283 Jensen, F. H., Keller, O. A., Tyack, P. L., & Visser, F. (2019). Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion. The Journal of Experimental Biology, 223, jeb.216283. doi:10.1242/jeb.216283 Echolocation Sensory ecology Mesopelagic foraging Deep-water environment Biosonar strategies Gain control Article 2019 ftwhoas https://doi.org/10.1242/jeb.216283 2022-05-28T23:03:32Z Author Posting. © Company of Biologists, 2019. This article is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 223 (2019): jeb.216283, doi:10.1242/jeb.216283. Toothed whales have evolved flexible biosonar systems to find, track and capture prey in diverse habitats. Delphinids, phocoenids and iniids adjust inter-click intervals and source levels gradually while approaching prey. In contrast, deep-diving beaked and sperm whales maintain relatively constant inter-click intervals and apparent output levels during the approach followed by a rapid transition into the foraging buzz, presumably to maintain a long-range acoustic scene in a multi-target environment. However, it remains unknown whether this rapid biosonar adjustment strategy is shared by delphinids foraging in deep waters. To test this, we investigated biosonar adjustments of a deep-diving delphinid, the Risso's dolphin (Grampus griseus). We analyzed inter-click interval and apparent output level adjustments recorded from sound recording tags to quantify in situ sensory adjustment during prey capture attempts. Risso's dolphins did not follow typical (20logR) biosonar adjustment patterns seen in shallow-water species, but instead maintained stable repetition rates and output levels up to the foraging buzz. Our results suggest that maintaining a long-range acoustic scene to exploit complex, multi-target prey layers is a common strategy amongst deep-diving toothed whales. Risso's dolphins transitioned rapidly into the foraging buzz just like beaked whales during most foraging attempts, but employed a more gradual biosonar adjustment in a subset (19%) of prey approaches. These were characterized by higher speeds and minimum specific acceleration, indicating higher prey capture efforts associated with evasive prey. Thus, tracking and capturing evasive prey using biosonar may require a more gradual switch between multi-target echolocation and ... Article in Journal/Newspaper toothed whales Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Experimental Biology |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Echolocation Sensory ecology Mesopelagic foraging Deep-water environment Biosonar strategies Gain control |
spellingShingle |
Echolocation Sensory ecology Mesopelagic foraging Deep-water environment Biosonar strategies Gain control Jensen, Frants H. Keller, Onno A. Tyack, Peter L. Visser, Fleur Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
topic_facet |
Echolocation Sensory ecology Mesopelagic foraging Deep-water environment Biosonar strategies Gain control |
description |
Author Posting. © Company of Biologists, 2019. This article is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 223 (2019): jeb.216283, doi:10.1242/jeb.216283. Toothed whales have evolved flexible biosonar systems to find, track and capture prey in diverse habitats. Delphinids, phocoenids and iniids adjust inter-click intervals and source levels gradually while approaching prey. In contrast, deep-diving beaked and sperm whales maintain relatively constant inter-click intervals and apparent output levels during the approach followed by a rapid transition into the foraging buzz, presumably to maintain a long-range acoustic scene in a multi-target environment. However, it remains unknown whether this rapid biosonar adjustment strategy is shared by delphinids foraging in deep waters. To test this, we investigated biosonar adjustments of a deep-diving delphinid, the Risso's dolphin (Grampus griseus). We analyzed inter-click interval and apparent output level adjustments recorded from sound recording tags to quantify in situ sensory adjustment during prey capture attempts. Risso's dolphins did not follow typical (20logR) biosonar adjustment patterns seen in shallow-water species, but instead maintained stable repetition rates and output levels up to the foraging buzz. Our results suggest that maintaining a long-range acoustic scene to exploit complex, multi-target prey layers is a common strategy amongst deep-diving toothed whales. Risso's dolphins transitioned rapidly into the foraging buzz just like beaked whales during most foraging attempts, but employed a more gradual biosonar adjustment in a subset (19%) of prey approaches. These were characterized by higher speeds and minimum specific acceleration, indicating higher prey capture efforts associated with evasive prey. Thus, tracking and capturing evasive prey using biosonar may require a more gradual switch between multi-target echolocation and ... |
format |
Article in Journal/Newspaper |
author |
Jensen, Frants H. Keller, Onno A. Tyack, Peter L. Visser, Fleur |
author_facet |
Jensen, Frants H. Keller, Onno A. Tyack, Peter L. Visser, Fleur |
author_sort |
Jensen, Frants H. |
title |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_short |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_full |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_fullStr |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_full_unstemmed |
Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion |
title_sort |
dynamic biosonar adjustment strategies in deep-diving risso's dolphins driven partly by prey evasion |
publisher |
Company of Biologists |
publishDate |
2019 |
url |
https://hdl.handle.net/1912/25421 |
genre |
toothed whales |
genre_facet |
toothed whales |
op_source |
Jensen, F. H., Keller, O. A., Tyack, P. L., & Visser, F. (2019). Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion. The Journal of Experimental Biology, 223, jeb.216283. doi:10.1242/jeb.216283 |
op_relation |
https://doi.org/10.1242/jeb.216283 Jensen, F. H., Keller, O. A., Tyack, P. L., & Visser, F. (2019). Dynamic biosonar adjustment strategies in deep-diving Risso's dolphins driven partly by prey evasion. The Journal of Experimental Biology, 223, jeb.216283. https://hdl.handle.net/1912/25421 doi:10.1242/jeb.216283 |
op_doi |
https://doi.org/10.1242/jeb.216283 |
container_title |
Journal of Experimental Biology |
_version_ |
1766218113218510848 |